My take on Pedro is the same as my take on all Reinsdorf's organization's hires, be it front office, managers, coaches or free agents. If he was really good, someone else would have hired him.
Burger should play mostly DH and 1B. He can get a spot start at 3B every now and then. When Burger or Vaughn is DHing, DHing, Eloy can start in LF with Benitendi as his late inning defensive caddy.